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FINANCIAL INSTRUMENTS (Details 3) - customer | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Credit Risk |  |
Number of major customers | 3 | 3
Accounts receivable | Credit risk | Major customer one |  |
Credit Risk |  |
Concentration risk (as a percent) | 32.00% | 35.00%
Accounts receivable | Credit risk | Major customer two |  |
Credit Risk |  |
Concentration risk (as a percent) | 32.00% | 30.00%
Accounts receivable | Credit risk | Major customer three |  |
Credit Risk |  |
Concentration risk (as a percent) | 29.00% | 27.00%

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